Each line in these files contains the following fields: markers
(optional), hostnames, bits, exponent, modulus, comment. The fields are
separated by spaces.

...

Alternately, hostnames may be stored in a hashed form which hides host
names and addresses should the file’s contents be disclosed. Hashed
hostnames start with a ‘|’ character. Only one hashed hostname may
appear on a single line and none of the above negation or wildcard opera-
tors may be applied.